9mm Marked YHM has long been a supplier of Caliber Marked upper receivers, but we soon asked oursleves "What if we want to change the caliber of that upper receiver?" For this reason, we now offer caliber marked dust covers for those who may end up...

Upper Receiver: YHM has long been a manufacturer of quality AR-15 Upper Receivers and is very proud to offer our A3 Upper Receivers under our own label. - See more at: http://yhm.net/flat-top-a3-upper-receiver-assembly.html#sthash.56hNupON.dpuf -These...